Not limited to people who suffer from depression.
It's happens periodically to me.I know for myself alot has to do with medication I take.

And yes there have been times after taking an afternoon nap where I awake to think I slept the night away and realize that it's early evening. Then I have to wonder if I'll be able to be tired enough to sleep the night through(never seems to impede my good night sleep regardless).

I was even the same way when I was off meds,sleeping to pass the time.

michael

world champion of snooze